One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,12,14)(11,13,15,16)(17,18)(19,28)(20,23)(21,25)(22,26)(24,27)(29,31)(30,32)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,23,30,24,31,22,25)(18,21,26,29,27,32,20,28)(1,3,4,7)(2,6,5,8)(11,15)(13,16)(17,20,22,27,24,26,23,18)(19,29,25,21,31,28,30,32)(11,15)(13,16)(17,21)(18,25)(19,26)(20,31)(22,28)(23,29)(24,32)(27,30) involution — undirected(17,22,24,23)(18,26,27,20)(19,25,31,30)(21,29,32,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.